Three years ago, Nora was half as old as Mary is now. If Mary is four years older than Nora then Mary is years old now.
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Ana's current age (a) is what maria's age was x years ago
a = 24 - x
x years ago, Maria's age (24 - x) was twice Ana's age (a - x)
2(a - x) = 24 - x
put 24 - x in for a in the second equation:
2(24 - x - x) = 24 - x
48 - 4x = 24 - x
24 = 3x
8 = x
Plug this back into a = 24 - x to find a, Ana's current age:
a = 24 - 8
Ana is currently 16.
Mẹ của Alice bây giờ đã bốn lần so với mẹ. Bốn năm trước đây, mẹ cô đã được ba mươi năm nhiều hơn cô. Alice bây giờ bao nhiêu tuổi?
bn muốn hỏi j vậy
When my mother was 24 years old, I was: 24:6=4 (years old)
==> The difference between my mother's age and my age that time was: 24 - 4 = 20 (years old)
Because the difference between my mother's age and my age never changes, so now, she is 20 years older than me.
We have a diagram: Bạn vẽ sơ đồ tuổi con hiện nay (My age now) với 1 phần, tuổi mẹ hiện nay (My mother's age now) với 3 phần bằng nhau như thế. (tự vẽ nha)
==> My mother's age now is: [20: (3-1)] * 3 = 30 (years old)
Answer: 30 years old
Mary is 19.
So Jane is: 19 - 5 = 14 ( years old)
Tom is: 14 - 2 = 12 ( years old)
You are: 12 + 4 = 16 ( years old)
And John is: 12 + 7 = 19 ( years old)
So Mary and John are the twins.
Mary's father's age:
\(12\times4=48\) (age)
Whole their age:
\(12+48=60\) (age)
Their average age is:
\(60\div2=30\) (age)
alice is 6 years old
beth is 7 years old
tim is 10 years old
mary is 14 years old